<!DOCTYPE html>
<meta charset="UTF-8">
<style>
ul a {
    -webkit-transition: padding .4s;
    -moz-transition: padding .4s;
    -o-transition: padding .4s;
    transition: padding .4s;
 }

 a:hover {
    padding-left: 20px;
 }
</style>
<ul>
   <li>
      <a href="#"> Hover Over Me </a>
   </li>
   <li>
      <a href="#"> Hover Over Me </a>
   </li>
   <li>
      <a href="#"> Hover Over Me </a>
   </li>
   <li>
      <a href="#"> Hover Over Me </a>
   </li>
</ul>

